A SURVEY OF EARLY POWER TRANSISTORS

by Joe A. Knight

TRANSITRON 1950s/60s GERMANIUM AND SILICON

POWER TRANSISTORS   

 

 

 

ABOVE, L-TO-R:   The first item is one of their cross-license RETMA items mentioned in the above ad, the 2N34", dated 8th week of 1955.  The second item back side shows the early Transitron logo "T" placed inside a square.   The last item is one of their hearing aid type devices, a "2N88".

 

Given the wide product line and substantial sales it would seem that Transitron would be following in line with all the other manufacturers and the semiconductor product process.   However, while they did secure the RETMA "2NXX" numbers for their own new devices, Transitron apparently never did complete the design spec registration process and thusly did not have their products officially released by RETMA.  This did not dampen their sales any, if at all, but does seem unusual.  This is likely why none of the various edition GE "Transistor Manuals" ever listed any non-RETMA  released Transitron items.

 

By mid-1954 Transitron was moving along with their own Power Transistor germanium types, and by late 1954 released the medium power "2N85" and "2N86", both rated at 3/4 watt dissipated power (see ad picture on the first page).  These used an external tab heat sink much like the T.I.  "X-2" medium power device of the same vintage.

 

 

 

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Joe A. Knight Early Power Transistor History – TRANSITRON  Page 2